$\left(8+4-3+5\right)-\left(9+6-2+1\right)$

$\lim_{x\to infinity}\left(x^2\left(lnx\right)^2\right)$

$\lim_{x\to4}\left(\frac{\sqrt{5}-2}{x^2-16}\right)$

$.8^2$

$\left(x\right)^2-2\left(\sqrt{x+2}\right)\left(x\right)+\left(\sqrt{x+2}\right)^2$

$rs\:\cdot\:2r^2s$

$2x+3=1-2x+x^2$